49_______.

【名词&注释】

雌激素(estrogen)、产蛋率(laying rate)、罗汉松(broadleaved podocarpus)、养鸡场(fowl run)、密切相关(closely related)

[单选题]49_______.

A. confirmed
B. decided
C. realized
D. acknowledged

举一反三：

[单选题]what might be the cause if the children’s sickness?A the crops didin’t dowell

A. there were too many insects
B. the visits brought in diseases
C. the pesticides were overused

[单选题]罗汉松种子为肉质的( )所包被。

A. 种皮
B. 果皮
C. 假种皮
D. 种托

[单选题]51_______

A. argued
B. shouted
C. begged
D. sobbed

[多选题]养鸡场鸡舍中清晨和傍晚用稳定的灯光延长光照时间．以提高产蛋率。下列分析正确的是

A. 延长光照刺激可直接通过体液调节提高产蛋率
B. 鸡的产蛋率与体内的雌激素水平密切相关^{(closely related)}
C. 鸡的产蛋行为受神经调节和体液调节共同作用
D. 鸡的产蛋行为受遗传因素和环境因素共同影响

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